MECHANISM OF B IN HYDROGEN-RESISTANCE J75 ALLOY

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	MECHANISM OF B IN HYDROGEN-RESISTANCE J75 ALLOY
	Liang Hao 1; Zhao Mingjiu 2; Chen Shenghu 2; Xu Yong 1; Wang Yongli 2; Rong Lijian 2
刊名	ACTA METALLURGICA SINICA
	2015-12-11
卷号	51 期号:12 页码:1538-1544
关键词	J75 alloy B hydrogen-resistant performance eta phase
ISSN号	0412-1961
通讯作者	Zhao Mingjiu(mjzhao@imr.ac.cn)
英文摘要	With the development of hydrogen economy, the demand of structural materials with high strength suitable for service in hydrogen or hydrogen-bearing environments such as storage of hydrogen gas was incremental. An optional structural materials is J75 alloy, which is mainly strengthened by an ordered fcc gamma' phase, Ni-3(Al, Ti), coherent with the austenite matrix. Investigation on J75 alloy indicated that the commercial alloy free of B would lose about half its ductility when charged with hydrogen, accompanied by a change of fracture mode from ductile rupture to brittle-appearing intergranular fracture. Otherwise, an improvement in ductility and hydrogen resistant performance was observed in the J75 alloy with trace B, however, its role in the alloy is unclear. So, in present work, mechanism of B in the J75 hydrogen-resistant alloy was investigated by means of OM, SEM, TEM, EPMA, 3DAP, SIMS, hydrogen penetration, thermal hydrogen charging experiments and tensile tests. It was found that a lot of Ti segregated at grain boundaries (GBs) in the alloy free of B, resulted in abundant precipitation of cellular eta phases. However, the cellular eta phase was not observed in the alloy with B, and it could be attributed to the segregation of B atoms at GBs and inhibited the segregation of Ti. A lower hydrogen diffusion coefficient was observed in the alloy with B than that in the alloy free of B by hydrogen permeation, indicating that diffusion velocity of H atoms in the alloy had been decreased by the addition of B. Moreover, segregation of B at GBs could not only inhibit the precipitation of eta phases but also decrease the number of H atoms there, which would improve the hydrogen-resistant performance of the alloy.
资助项目	National Natural Science Foundation of China and China Academy of Engineering Physics[U1230118] ; National Natural Science Foundation of China[51171178]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000367770600015
资助机构	National Natural Science Foundation of China and China Academy of Engineering Physics ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/121495]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhao Mingjiu
作者单位	1.China Acad Engn Phys, Inst Syst Engn, Mianyang 621900, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Liang Hao,Zhao Mingjiu,Chen Shenghu,et al. MECHANISM OF B IN HYDROGEN-RESISTANCE J75 ALLOY[J]. ACTA METALLURGICA SINICA,2015,51(12):1538-1544.
APA	Liang Hao,Zhao Mingjiu,Chen Shenghu,Xu Yong,Wang Yongli,&Rong Lijian.(2015).MECHANISM OF B IN HYDROGEN-RESISTANCE J75 ALLOY.ACTA METALLURGICA SINICA,51(12),1538-1544.
MLA	Liang Hao,et al."MECHANISM OF B IN HYDROGEN-RESISTANCE J75 ALLOY".ACTA METALLURGICA SINICA 51.12(2015):1538-1544.